./math/hs-contravariant, Contravariant functors

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Branch: pkgsrc-2021Q4, Version: 1.5.3nb1, Package name: hs-contravariant-1.5.3nb1, Maintainer: pho

Contravariant functors, sometimes referred to colloquially as
cofunctor, even though the dual of a functor is just a functor. As
with functor the definition of contravariant for a given ADT is
unambiguous.

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